src/code/cold-init-helper-macros.lisp

   1 ;;;; This file contains machinery for collecting forms that, in the
   2 ;;;; target Lisp, must happen before top level forms are run. The
   3 ;;;; forms are stuffed into named functions which will be explicitly
   4 ;;;; called in the appropriate order by !COLD-INIT.
   5
   6 ;;;; This software is part of the SBCL system. See the README file for
   7 ;;;; more information.
   8 ;;;;
   9 ;;;; This software is derived from the CMU CL system, which was
  10 ;;;; written at Carnegie Mellon University and released into the
  11 ;;;; public domain. The software is in the public domain and is
  12 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
  13 ;;;; files for more information.
  14
  15 (in-package "SB!KERNEL")
  16 ;;; FIXME: Perhaps this belongs in the %SYS package like some other
  17 ;;; cold load stuff.
  18
  19 (eval-when (:compile-toplevel :load-toplevel :execute)
  20   (defvar *cold-init-forms*))
  21
  22 (defmacro !begin-collecting-cold-init-forms ()
  23   #+sb-xc '(eval-when (:compile-toplevel :execute)
  24              (when (boundp '*cold-init-forms*)
  25                (warn "discarding old *COLD-INIT-FORMS* value"))
  26              (setf *cold-init-forms* nil))
  27   #-sb-xc nil)
  28
  29 ;;; Note: Unlike the analogous COLD-INIT macro in CMU CL, this macro
  30 ;;; makes no attempt to simulate a top level situation by treating
  31 ;;; EVAL-WHEN forms specially.
  32 (defmacro !cold-init-forms (&rest forms)
  33   ;; In the target Lisp, stuff the forms into a named function which
  34   ;; will presumably be executed at the appropriate stage of cold load
  35   ;; (i.e. basically as soon as possible).
  36   #+sb-xc (progn
  37             (setf *cold-init-forms*
  38                   (nconc *cold-init-forms* (copy-list forms)))
  39             nil)
  40   ;; In the cross-compilation host Lisp, cold load might not be a
  41   ;; meaningful concept and in any case would have happened long ago,
  42   ;; so just execute the forms at load time (i.e. basically as soon as
  43   ;; possible).
  44   #-sb-xc `(progn ,@forms))
  45
  46 (defmacro !defun-from-collected-cold-init-forms (name)
  47   #+sb-xc `(progn
  48              (defun ,name ()
  49                ,@*cold-init-forms*
  50                (values))
  51              (eval-when (:compile-toplevel :execute)
  52                (makunbound '*cold-init-forms*)))
  53   #-sb-xc (declare (ignore name)))
  54
  55 ;;; FIXME: Consider renaming this file asap.lisp,
  56 ;;; and the renaming the various things
  57 ;;;   *ASAP-FORMS* or *REVERSED-ASAP-FORMS*
  58 ;;;   WITH-ASAP-FORMS
  59 ;;;   ASAP or EVAL-WHEN-COLD-LOAD
  60 ;;;   DEFUN-FROM-ASAP-FORMS
  61 ;;; If so, add a comment explaining that ASAP is colloquial English for "as
  62 ;;; soon as possible", and has nothing to do with "system area pointer".